Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cf9f77a78546d8…

MALICIOUS

PDF

69.7 KB Created: 2021-02-12 10:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 11d4802570dcce03c0e7d1be3fdec2e0 SHA-1: 30ca512015635053ddffa7d0bfc6994228f9eb98 SHA-256: 84cf9f77a78546d88f066d2a9ab30cace0c18811146fe158211b2700f2aa2714
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=wild+bills+pawn PDF link annotation
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/buburivawe_wulorozutidit_bisaxada.pdfIn PDF document text
    • http://jusapp.club/mozexiwegewirosodajikz1hv.pdfIn PDF document text
    • http://leftoutclub.com/quem_pensa_enriquece_minhatecah0xq8.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/PSjdif9/asa_5505_security_plus_license_features.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/YuihZ8G/the_wolfpack_now_tv.pdfIn PDF document text
    • http://store50off.info/minecraft_flux_b11_free_downloadklllg.pdfIn PDF document text
    • http://icily.xyz/57873280731f7bla.pdfIn PDF document text
    • http://study-english-04.space/how_to_learn_anything_faster_bookew1c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakafemapekumu.epizy.com/7109567059.pdfIn PDF document text
    • http://biwoxurovoke.rf.gd/cisco_ccip_qos_642-_642.pdfIn PDF document text
    • http://tofezaniv.rf.gd/aplikasi_format_factory._exe.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/76525175210.pdfIn PDF document text
    • http://rozipiliwune.epizy.com/inverse_function_worksheet_with_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 5100 bytes
SHA-256: 3aba9e440409a78d31ad73d6e7bf55ed905692992230b9e9c02483f1d1fa3c50
font_01_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 10936 bytes
SHA-256: 8d021d155838b2666b2464b617e0f7b938fa2fa72a7f99a8696c9c5d98d2f7ba

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